National highways are divided into three categories according to geographical trends. Starting with 1, 2, 3, starting with 1 is the capital radiation (except 1 12 national highway), starting with 2 is the north-south line, and starting with 3 is the east-west line.

1. Capital radiation: The first category is the road with fan radiation centered on Beijing, * *12, about 14000 km, numbered10/~/kloc-0.

2. North-South Longitudinal Line: The second category is North-South Highway, with 27 lines, about 39,000 kilometers, numbered 201~ 228 (No.226).

3. East-west horizontal line: The third category is east-west highway, with 33 lines, about 53,000 kilometers, numbered 301~ 330 (except 313), 338 ~ 340 and 343.

Extended data:

The difference between national highway, provincial highway and expressway;

First, national highways and provincial highways are the administrative levels of highways and represent the administrative significance of a highway to a great extent. After the national and provincial roads, there are county roads, township roads, village roads and special roads.

1. The number of the provincial highway starts with the letter S, which is similar to the national highway. S 1xx stands for radial provincial road from provincial capital city. S2xx stands for north-south longitudinal provincial road, and S3xx stands for east-west transverse provincial road.

2. The number of county roads begins with the letter X+ number.

3. The serial number of township roads starts with y+.

4. The number of the village road is indicated by the road beginning with the letter C. ..

5. The number of the private highway begins with the letter Z. ..

Second, national highway and expressway are not the same concept.

Expressway belongs to the concept of highway classification. The national transportation department classifies expressways into different types according to a series of technical standards such as road width, design speed and daily average capacity. Expressway is the highest grade highway in China, followed by first-class highway, second-class highway, third-class highway and fourth-class highway.

References:

Baidu encyclopedia-national highway

Baidu encyclopedia-expressway